On November 4, 2008, the Commission adopted a Second Report and Order and Memorandum Opinion and Order (Second Report and Order) in ET Docket 04-186 that established rules to allow new, sophisticated, unlicensed wireless devices to operate in broadcast television spectrum at locations where that spectrum is unused by licensed services. This unused TV spectrum is commonly referred to as television “white spaces.” The rules will allow for the use of unlicensed TV band devices in the unused spectrum to provide broadband data and other services for consumers and businesses.

To prevent interference to authorized users of the TV bands, TV band devices must include a geo-location capability and the capability to access a database that identifies incumbent users entitled to interference protection, including, for example, full power and low power TV stations, broadcast auxiliary point-to-point facilities, PLMRS/CMRS operations on channels 14-20, and the Offshore Radiotelephone Service. The database will tell a TV band device which TV channels are vacant and can be used at its location. The database also will be used to register the locations of fixed TV band devices and protected locations and channels of incumbent services that are not recorded in Commission databases. The Commission decided in the Second Report and Order to designate one or more database administrators from the private sector to create and operate TV band database(s), which will be a privately owned and operated service. Database administrators may charge fees to register fixed TV band devices and temporary broadcast auxiliary fixed links and to provide lists of available channels to TV band devices.

: White space is unused spectrum that sits between TV channels. The 300MHz to 400MHz of unused spectrum is considered prime spectrum for offering wireless broadband services because it can travel long distances and penetrate through walls. The FCC unanimously agreed in November 2008 to open up this spectrum for unlicensed use . Even so, technical issues to allow device makers and service providers to use the spectrum still need to be worked out. "

..."The roll out of TV white space spectrum might also serve as a template for freeing other underutilized spectrum.

"About 90 percent of the licensed spectrum is unused," said Joe Hamilla, chief operating officer at Spectrum Bridge, a company that runs an online spectrum license exchange. "What's happening with TV white space is really the FCC's first attempt at trying to make more efficient use of underused spectrum."